Cut Sheet

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APPLICATION
Consideration 12V Magnetic Transformer 12V Electronic Driver/Transformer
• Trac run length • Use for medium to long run lengths and • Use for short to medium run lengths and low to
medium to high wattage systems medium wattage systems
• Dimming • For optimal results, use dimmers specifically • For optimal results, use dimmers specifically
designed for use with magnetic transformers; designed for use with electronic transformers;
transformers used with Juno LED fixtures should transformers used with Juno LED fixtures should
only be operated with dimmers pre-qualified for only be operated with dimmers pre-qualified for
suitability by Juno Engineering suitability by Juno Engineering
• Transformer Location • Install in well ventilated locations where ambient • Install surface mount units in well-ventilated
temperature will not exceed 140°F (60°C); location
where ambient temperature will not exceed
transformers must be accessible. 120°F (50°C)
D3.1.3
Voltage drop is a function of the following factors:
Wire Length:
As the wire length from the supply to the fixture becomes longer,
voltage drop increases.
Wire Diameter:
As the wire cross-sectional area becomes smaller, voltage drop
increases (this is related to the resistance per foot of wire).
Amperage of the Electrical Load:
As the amperage of the electrical load increases, voltage drop
also increases.
Voltage drop in 12 volt systems is 10 times greater
than in 120 volt systems.
This is because a load of the same wattage has 10 times greater
amperage in 12 volts as compared to 120 volts.
This is illustrated by the formula:
WATTS = VOLTS x AMPS
Assuming a 120 watt electrical load:
120 WATTS = 12 VOLTS x 10 AMPS
120 WATTS = 120 VOLTS x 1 AMP
Voltage drop from a magnetic transformer to the
first lampholder on 12V Trac 12 can be
calculated as follows:
VOLTAGE DROP = 2D x A x Ω
WHERE:
D = Distance in feet from transformer to 1st lamp
A = Total amperage load of all lampholders on the trac
Ω = Resistance per foot of wire per the following chart:
Wire Gauge
Resistance Per Foot of Wire (OHMS)
#8 .00065
#10 .00104
#12 .00166
(A =
______
=
______
)
WATTS
WATTS
VOLTS
12
VOLTAGE DROP CALCULATIONS (FOR MAGNETIC TRANSFORMERS)
TRAC 12, TRAC 12/25, FLEX 12
Low Voltage Systems
12V AC REMOTE MOUNT MAGNETIC TRANSFORMERS
TL575, TL549N , TL550N, TL554N and TF5150